Because Kimmel's playing "Ross," naturally, most of the jokes revolve around Ross's sexual prowess. For example, when Cox shows up as Monica, her opening line is, "Hey Ross, everyone down at Central Perk is talking about how good you are at making love," and Kudrow enters with, "Hey, are you guys talking about how good Ross is at making love without me?" (According to Kimmel's script, Joey and Chandler are both dead – and for a very good reason.)